From 2917aed993dffd46ff665e428c0e6477638b1538 Mon Sep 17 00:00:00 2001
From: Esteve Fernandez <esteve@apache.org>
Date: Thu, 25 Jun 2015 11:49:33 -0700
Subject: [PATCH] Added on_parameter_event to SyncParametersClient

---
 rclcpp/include/rclcpp/parameter_client.hpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/rclcpp/include/rclcpp/parameter_client.hpp b/rclcpp/include/rclcpp/parameter_client.hpp
index 672b099d85..34af567f4e 100644
--- a/rclcpp/include/rclcpp/parameter_client.hpp
+++ b/rclcpp/include/rclcpp/parameter_client.hpp
@@ -229,7 +229,7 @@ class AsyncParametersClient
 
   template<typename FunctorT>
   typename rclcpp::subscription::Subscription<rcl_interfaces::msg::ParameterEvent>::SharedPtr
-  on_parameter_event(FunctorT callback)
+  on_parameter_event(FunctorT & callback)
   {
     // TODO(esteve): remove hardcoded values
     return node_->create_subscription<rcl_interfaces::msg::ParameterEvent>("parameter_events",
@@ -308,6 +308,13 @@ class SyncParametersClient
     return rclcpp::executors::spin_node_until_future_complete(*executor_, node_, f).get();
   }
 
+  template<typename FunctorT>
+  typename rclcpp::subscription::Subscription<rcl_interfaces::msg::ParameterEvent>::SharedPtr
+  on_parameter_event(FunctorT & callback)
+  {
+    return async_parameters_client_->on_parameter_event(callback);
+  }
+
 private:
   rclcpp::executor::Executor::SharedPtr executor_;
   rclcpp::node::Node::SharedPtr node_;